CN1291075C

CN1291075C - Polymer filaments with profiled cross-sections

Info

Publication number: CN1291075C
Application number: CNB018125689A
Authority: CN
Inventors: P·M·兰卡斯特
Original assignee: INVISTA TECHNOLOGIES Sarl; EI Du Pont de Nemours and Co
Current assignee: Invista Technologies Sarl
Priority date: 2000-07-10
Filing date: 2001-07-05
Publication date: 2006-12-20
Anticipated expiration: 2021-07-05
Also published as: EP1299581A1; ATE401434T1; MXPA03000149A; BR0112503A; JP2004502882A; SK162003A3; GB2364667A; GB0016926D0; DE60134856D1; KR100761640B1; BR0112503B1; CA2410555C; PL205183B1; TW513493B; EP1299581B1; WO2002004720A1; ES2310184T3; KR20030020918A; CA2410555A1; CN1500161A

Abstract

The present invention provides a profiled polymer filament having an open hollow cross-sectional shape perpendicular to the longitudinal axis of the filament, wherein the cross-section is dimensioned such that the filament avoids interlocking with a second filament having the same cross-section. The invention also provides a process for making such filaments by melt spinning a polyamide, and a spinneret suitable for use in melt spinning such filaments.

Description

Polymer filaments with profiled cross-section

Invention field

What the present invention relates to is synthetic polymer filament, and this long filament has " open hollow " profiled cross-section perpendicular to the long filament longitudinal axis.The invention still further relates to and be used for the spinning plate that filament melt extrudes and relate to by melt and extrude the method for making long filament.

Background technology

Come from synthetic polymer, especially resemble the textile fabric of polyamide polymer of nylon 66 and nylon 6 or long filament and by the multifilament of similar polyamide polymer melt extruded normally as partially oriented yarn (POY) and drawn yarn and make clothes.Elongation at break and drawn yarn that POY will have greater than about 55% will have lower percentage elongation.For each long filament that multifilament constituted by all kinds such as POY and drawn yarn, circle is prevailing shape of cross section.The variation that comprises the special filament cross shape of three blades or 6 blade shapes is disclosed by Japanese documentation JP01-20243 (Nihon Ester KK), the scalloped oval cross section is as by U.S. Pat 5,834,119 (Roop) disclose, and the hollow polyamide filaments with single longitudinal void has been disclosed in U.S. Pat 5, among 604,036 (people such as Bennett).

The POY and the stretching silk thread of the known various profiled cross-section shapes of all above-mentioned examples.Have some shape of cross sections rather than round-shaped long filament for fabric with have and change visual appearance, opacity and protective layer and provide multifilament than the clothes of light weight.The yarn that is made of hollow filament, for example the yarn of above-mentioned United States Patent (USP) provides to compare with clothes and with traditional circular long filament than the fabric of light weight and has strengthened heat-resistant quality.When by traditional technology, for example air flow jetting distortion (AJT) and false twist texturing (FTT) and push when obtaining bulk yarn, the hollow filament yarn is particularly suitable for the clothes purposes.The hollow flat yarn that is directly used in the field of weaving also is known.

Two kinds of yarns of partially oriented and flat nylon of high-voidage volume hollow form are disclosed by people such as Bennett.Yet the long filament with longitudinal void is difficult to closure preferably when spinning, and in fact also can damage its shape during deformation processing.This just might the result form the long filament of letter " C shape " and/or flatten the pipe shape of cross section.The long filament of letter C shape can closely make up by the breach with open space in the adjacency long filament.In addition, because the result that such situation takes place, letter C cross-sectional shape long filament and flattening pipe cross section produce bad yarn and fabric property.The thermal resistance that increases Density and minimizing fabric and clothes is undesirable characteristic.And the DYED FABRICS streak is exerted an influence the yarn that is made of the long filament with various fracture longitudinal voids and intac long filament space provides development space for the contingency bacterium.

Have now found that the above-mentioned shortcoming of enumerating can overcome by the polymer filaments product with a kind of novel cross section.

Summary of the invention

The invention provides a kind of special-shaped long filament that constitutes by synthetic polymer, its have one with perpendicular " open hollow " shape of cross section of the longitudinal axis of long filament.The chosen size of its cross section makes first long filament avoid coupling together with second long filament with identical cross-section.This just means that the zone of approaching each end of cross section is wider than the gap between the described zone of the opening that limits the open hollow cross section.

Profiled cross-section long filament of the present invention is to provide by novel shape and the designing institute of extruding pore.Long filament of the present invention is by the directly preparation by a kind of crinosity pore spinning plate of melt extruded synthetic polymer.A kind of C shape of term " open hollow " ordinary representation or U-shaped shape cross section, it has a hollow center, with an entity area, this area limiting is around the wall portion of hollow center extension with the encirclement hollow center, but an opening connection center on a side of wall is to the outside of long filament.Opening is narrower than the diameter of hollow center, forms a throat or contraction thus between the outside of hollow center and long filament.

Be that long filament comprises that one surrounds the entity part in central hollow zone basically preferably.An opening leads to the central hollow zone by the outside of long filament.Entity part comprises two branches, and described branch ends in the bottom.The bottom relative two surfaces limit the necks (narrow dimension) of openings.The neck of opening is to be not more than 75 °, preferably from 10 ° to 60 ° facing to a radial angle α who is not more than 90 ° preferably.As seeing in Fig. 1, radial angle α is limited to and originates from two ray R1 that C orders and the angle between the R2.Point C is positioned on the inner surface of entity part of long filament, its with the reference line R3 that is connected the bottom end points tangently apart farthest.Each ray R1, R2 from a C extend and the bottom apparent surface of tangent qualification opening D throat on a bit.Entity part is facing to a radial angle, this angle equal 360 ° deduct α (360 °-α).Be that the entity part of cross section is facing to the radial angle that is at least 270 ° preferably.Be that entity part faces toward the radial angle that is at least 300 ° better.

Long filament according to the present invention is fit to avoid being bonded with each other or banking up of long filament.For example, the hook-shaped joint that inserts two cross sections that the opening on second filament cross produces owing to an end of the entity part of first filament cross is avoided.This precautionary measures can realize by stating content, face toward a big radial angle by the entity part that makes cross section, can make the opening on the filament cross very little.On the other hand, the end of the entity part of cross section can be extended be inserted in the opening of other long filament preventing.

Can form a single full curve according to the cross section entity part in the long filament of the present invention.Be that cross section comprises one " center arc " or has base portion and two sidepieces or " branch " part of first and second ends preferably.Component by first and second ends of center arch section with basically mutually side by side relationship extend.

In some preferred embodiments, for example the filament cross geometry is shown among Fig. 1, the filament cross shape facility is a center arch section 1 (horizontal-extending among Fig. 1) and is connected first and second on the arch section of center, normally parallel, prolong component 2,3 (vertically extending among Fig. 1).End portion with respect to each branch (2,3) that engages with center arch section 1 limits an extended bottom 4.Each bottom 4 is characterised in that dimensions length F, the length of bottom, as shown in Figure 1.The abnormity filament cross is an opening in the center.This opening portion is combined on three sidepieces by component 2,3 and center arcuate base 1.Bottom 4 limits the aperture with the dimension D of leading to opening portion, as shown in Figure 1 with the orientation of side by side relationship basically between the opposed face of bottom.Dimension D is less than size F.Consequently, any bottom in any branch of abnormity long filament is enough big with respect to the aperture between the paired branch on what its same long filament in office, make the bottom of the long filament of winning avoid holding (binding) between intrafascicular other long filament branch of multifilament textile, as shown in Figure 2.

Be that the polymer that is used to form special-shaped polymer filaments according to the present invention is a kind of polyamide preferably.Be better, according to the formic acid method, polyamide polymer has the relative viscosity greater than 40, and is according to the formic acid method more preferably, and the relative viscosity of polyamide is in 46 to 56 scopes.Be that polyamide is to select in the group that is made of nylon 66 and nylon 6 and copolyamide preferably.

Be preferably, the mono filament linear density is by 0.5 to 20 dtex, and being more preferably it is 2 to 10 dtexs.Best is that it is less than 4 dtexs.Be that the filament cross shape is constant along filament length basically preferably.Be preferably, the long filament heterogeneity is less than Wu Site irregularity 1%.

Special-shaped long filament according to the present invention provides a kind of yarn of light Unit Weight, especially at AJT (air flow jetting distortion) or FTT (false twist texturing) afterwards.Yarn contains high free volume of air space.The air space volume helps to strengthen the fabric produced by yarn and the thermal resistance of clothes.When yarn by knitting or weave the fabric that yarn when becoming fabric provides the less tightness of similar structures fabric that a kind of ratio is made of complete circular cross section long filament.In addition, yarn presents high wettability power.

Therefore, the present invention also provides a kind of multifilament, and this multifilament comprises that at least a portion is according to special-shaped long filament of the present invention.

Be preferably, yarn comprise weight be at least 10% according to special-shaped long filament of the present invention, be more preferably and comprise such long filament of at least 25%, more be preferably and comprise such long filament of at least 50%, and preferably it mainly is to be made of such long filament.

The present invention further provides a kind of goods that comprise at least a portion according to yarn of the present invention.Be that its goods comprise a kind of by yarn knitting according to the present invention or weave the fabric that forms preferably.

Another aspect of the present invention is a kind ofly to be used for becoming long filament by melt extruding of polymer and to produce spinning head according to special-shaped open hollow long filament of the present invention.This spinning head comprises a spinnerets with the upper and lower surface that connects by capillary module.Shape capillaceous, size and structure are suitable for the melt spinning according to long filament of the present invention.Especially, arbitrary capillary comprises two adjacent sections, shown in Fig. 3 a, therefore, since the molten polymer flow of each section between section a bit merge or each capillary has open hollow cross section as Fig. 3 b, can obtain along long filament axis open hollow filament cross longitudinally.

The preferable spinning plate that is used for producing special-shaped open hollow long filament is the spinning plate capillaceous that a kind of two sections that have by Fig. 3 a constitute.Each section is to be made of a straightway part 30, and this straightway part has a joint in each end, and it has a pair of projection.At first end, paired projection equal areas and each projection comprise that one ends in the straight line portion 31,32 of circular portion 33,34.In second (relative first) end, it has the projection of a pair of non-homalographic.The first non-homalographic projection is to be made of and the second non-homalographic projection is to be made of straight line portion 37 and circular portion 38 straight line portion 35 and circular portion 36.Therefore, each section capillaceous has three equal projections, two portion places at one end, and one at relative place, end.Uniqueness (longer) projection that is provided on each section is to be made of straight line portion 37 and circular portion 38.Be that each capillary tube segment is the mirror image of other section preferably.Be better, each section be other section can not be overlapping mirror image, for example illustrated by Fig. 3 a.Can not mean that each section has the convenience as people right-hand man by overlapping mirror.

Open hollow filament cross perpendicular to the long filament longitudinal axis is to merge and obtain when molten thermoplastic polymers a bit the locating between two sections projection from each capillary tube segment.That is, open hollow filament cross of the present invention is to form when molten polymer flow is being shown in when merging between the circular portion 38 that the left and right sides capillary tube segment among Fig. 3 a faces.

Have at capillary itself under the situation of an open hollow cross section, the capillary that is shown in Fig. 3 b is a kind of silk of spray preferably geometric cross-sectional shape that is used to produce special-shaped open hollow long filament.Each capillary has such shape of cross section, and it comprises first straight line portion 40, and this straight line portion has relative first end and second end mutually.Second straight line portion 48 and the 3rd straight line portion 50 are that the first end branch from first straight line portion 40 comes out.Second straight line portion 48 ends in a circular portion 49, and the 3rd straight line portion 50 extends to branch a bit; Wherein the 4th straight line portion 53 and the 5th straight line portion 52 extend from this point of branch.The the 4th and the 5th straight line portion has the area that does not wait and respectively ends in circular portion 54 and 51.Equally, the 6th straight line portion 41 and the 7th straight line portion 43 are that the second end branch from first straight line portion comes out.The 6th straight line portion 41 ends in a circular portion 42, and the 7th straight line portion 43 extends to branch a bit; Wherein the 8th straight line portion 46 and the 9th straight line portion 44 extend from the described point of branch, and the 8th and the 9th straight line portion has the area that does not wait and respectively ends in circular portion 45 and 47.

On the other hand, the invention provides a kind of be used to make have the drawing that improves filament cross according to the present invention and the technology of partially oriented yarn (POY).Generally, its technology comprises a kind of polyamide melt of extruding, is typically 40 to 60RV (according to the formic acid methods) and is preferably 48 to 52RV nylon 66 or nylon 6, to form special-shaped long filament.Spinning head according to the present invention is to remain on 245 ℃ in the scope of 295 ℃ of selections, preferably at 280 ℃.The plurality of threads that squeezes out through spinning head is cooled to form solid long filament in a horizontal air flow.These long filaments usable oils be wound as multifilament with the speed greater than 3000 meters/minute (m/min) before is handled, and assembles, and entwines and stretches, and perhaps keeps not stretching.

Now referring to the process schematic representation shown in Fig. 5, a drawing is prepared from by path A.Molten polymer 10, promptly polyamide is pumped into filament spinning component 20 and pressed spinning plate to form long filament 40.The long filament that is sprayed is by laterally air flow 50 coolings, and its air flow has about 0.15 to 0.5 meter/minute air velocity.Chilled long filament is converged to yarn 60, and is applied on the yarn beam that is obtained preferably at 70 places oil and water finishing agent.Thereby yarn 60 becomes the yarn 90 of entwining through the first air interlacing nozzle 80 forward.Yarn 90 is forward to first godet roller 92 (feeding roller) and the separate roller that links to each other, in case sliding stop, second godet roller 94 (draw roll) and the separate roller that links to each other arrives soon after around several circles.Draw roll 94 better is that 80% superficial velocity is moved with greater than 60 to 100% of feeding roller 92.The overall coefficient that yarn beam is preferably thus with about 1.8 is stretched (elongation), and the fiber number that reduces whole yarn is to form yarn 100.The yarn 100 that has stretched is preferably as stretching and lax yarn to adjust by a relaxation device 110 is processed of implementing in tradition in the art.Can use any known relaxation device, it comprises steam, adds hot fluid, heat pipe, hot piece, warm-up mill.Song Chi yarn beam 120 selectively through second interlacing nozzle 130 and at lax yarn 140 with greater than 3000 meters/minute, oiling treatment selectively before more preferably about 3800 meters/minute winding speed is wound on the bobbin 150.The drawing that is obtained has 25 to 45%, is preferably 40 to 45% percentage elongation and 35 to 45cN/tex intensity.

In addition, referring to the process schematic representation among Fig. 5, partially oriented yarn (POY) is prepared from by path B.Molten polymer 10, promptly polyamide is pumped into filament spinning component 20 and pressed spinning plate to form long filament 40.The long filament of being discharged is by laterally air flow 50 coolings, and its air flow has about 0.15 to 0.5 meter/minute air velocity.Chilled long filament is converged to yarn 60, and is applied on the yarn beam that is obtained preferably at 70 places oil and water finishing agent.Yarn 60 is the steam gas that contains interlayer (interfloor) pipe 75 through being known in the art forward.The yarn 85 of steam treatment mixes mutually at 80 places, and partly around godet roller 82 and 84 loopings, any winding tension that its control yarn is subjected to changes.Yarn 115 is wound as a yarn package with about 3800 meters/minute speed on bobbin 160.The POY that is produced is preferably has 55 to 85%, and more preferably 75% percentage elongation and 25 is preferably the intensity of 30cN/tex to 40cN/tex.

Brief Description Of Drawings

Fig. 1 has represented a cross section that vertically has advantageous cross sections shape long filament longitudinal axis, shows size R, F and D, ray R1, R2, reference Point C, tangent line reference line R3 and angle α;

Fig. 2 is vertical cross section according to of the present invention two adjacent long filament longitudinal axis;

Fig. 3 a is the plan view (in proportion) of two sections spinning head capillary shape of cross sections according to the present invention;

Fig. 3 b is the plan view (in proportion) of one section spinning head capillary shape of cross section according to the present invention;

Fig. 4 a is the yarn beam microphoto of the yarn cross section that includes 26 long filaments produced by melt spinning by the spinning head capillary shape of cross section of Fig. 3 a according to the present invention;

Fig. 4 b is the yarn beam microphoto of the yarn cross section that includes 26 long filaments produced by melt spinning by the spinning head capillary shape of cross section of Fig. 3 b according to the present invention;

Fig. 5 is the schematic diagram that is used to realize the equipment of complete drawing (A) and POY (B) spinning technique according to the present invention.

Method of testing

The water absorption test method: the principle of method is vertical hanging one fabric strip, immerses in the water with its lower end.With the regular time interval measurement height that is raised on the fabric waterborne.The fabric sample that is adopted is that 300mm is long and 25mm is wide.Sample is in relative humidity 85%+/-5% and 20 ℃+/-2 ℃ of temperature are following 16 hours.After 2 minutes, measure the maximum vertical penetration of 20 ℃+/-2 ℃ of water.It highly is point measurement by the surface of water maximum liter waterborne to the fabric.Mean value for 3 measurements of each vertical fabric direction record.

The fabric thickness method of testing: fabric thickness is the upper surface of measured material under certain pressure and the average distance between the lower surface.The same water absorption test of the treatment conditions of fabric sample.Employed measurement mechanism is a kind of 50cm of having ²The Xi Lai of presser feet (Shirley) thickness measuring instrument.Make presser feet drop on the fabric at itself momentum.Measurement is repeated 10 times and average and standard deviation is recorded to immediate 0.05mm.

Example

Example 1

The device that the multifilament textile (yarn 1A) of first kind of 96 dtex and 26 threads uses schematically to be shown in the accompanying drawing 5 and have two section spinneretss spinnings capillaceous according to Fig. 3 a and be POY.

Nylon 66 polymer chipss that obtain 49.4RV by the formic acid method be melted in 10 and pushed filter assemblies 20 and with 280 ℃ of spinning temperatures through having 26 spinneretss 30 capillaceous of the section shape of cross section that is shown in Fig. 3 a.

Next, the long filament 40 that is sprayed is cooled by horizontal air flow 50, and its air velocity is 0.45 meter/minute.The cooling air is to be directed in Fig. 3 a mode, at first to run into two sections relative bossings 38 capillaceous.The long filament 60 that is cooled is converged to yarn at 70 places, is applied on the yarn beam that is obtained at 70 places oil and water treatment agent.The convergence yarn that has applied finishing agent advances along the circuit B among Fig. 5.Yarn was transferred the steam ambient that contains interlayer pipe (interfloor tube) 75.Entwined by device 80 by the yarn 85 of steam treatment.The yarn 115 of being entwined is reeled on bobbin 160 with 3800 meters/minute speed and is become a yarn package.

In this way the POY of Sheng Chaning has the yarn linear density of 96 dtexs, the intensity of elongation at break about 75% and 30cN/tex.The cross section of yarn is shown among Fig. 4 a.

The partially oriented yarn of multifilament (yarn 1B) of second kind of 96 dtex and 26 threads fully as first kind of POY use the device that is shown among Fig. 5 to spin.For yarn 1B, use the spinnerets capillaceous that has according to Fig. 3 b.Percentage elongation and strength characteristics are same as first kind of POY.The cross section of yarn 1B is shown among Fig. 4 b.

The comparison multifilament textile of a kind of 96 dtexs and 26 threads (yarn 1C) is spinned with the method that is entirely identical to first kind of yarn, has just replaced spinnerets, and this spinnerets has the capillary of 26 " circular cross section " shape.

All samples, 1A and 1B (yarn of the present invention) and 1C (a kind of circular cross section is yarn relatively) are respectively 8 strands and use a kind of HEBERLEIN HEMAJET (registration mark) to be made it to become the textured yarns that 730 dtexs are taken advantage of 208 long filaments (8 * 26 long filament) by air jet texturing (AJT) subsequently.These textured yarnss are 2 strands and knitting becoming " full cardigan structure " and carry out hot conduction test.

The method that hot conduction test method is ASTM D1518-85 basically (1990 authorization again).This method is measured from one warm, dry, constant temperature, the flat board of level is upwards through the heat conducting time rating of a knitting full cardigan test material layer to a relatively placidity, cool environment.Measure thermal resistance and calculate thermal insulation value or CLO value." CLO " in ASTM D1518 " cloth thermal resistance " unit and equal 0.155 (℃ m ²W ^-1).The base temperature is 25 ℃ of (T ₁) and circle batten (head plate) temperature is 35 ℃ of (T ₂).Be applied on the full cardigan fabric 260Nm at minimum pressure during the test process ^-2Each sample test 3 times provides average result, and it is recorded in the following table 1.

The test result that is recorded in the table 1 has represented that preferred open hollow cross section is with respect to the resistive 13-15% that improved of circular cross section yarn heat in a kind of knitted structure.Similar, preferred open hollow cross section has improved 13-15% with respect to circular cross section yarn CLO value in knitted structure.Obviously, the runin mouth hollow filament yarn that is subjected to of knitted structure is a kind of thing of thermal insulation preferably with respect to circular filament yarn.

Table 1

The yarn that in full cardigan is knitting, uses	Thermal resistance m ²℃W ^-1x(10 ³)	CLO value m ²℃W ^-1/(0.155) ASTM D1518-85
The yarn that in full cardigan is knitting, uses	Thermal resistance m ²℃W ^-1x(10 ³)	CLO value m ²℃W ^-1/(0.155) ASTM D1518-85	Yarn 1A (2x730f208) uses the invention cross section of two sections spinning heads	103.7	0.67
Yarn 1B (2x730f208) uses the invention cross section of one section spinning head	105.0	0.68		103.7	0.67
	105.0	0.68	Yarn 1C (2x730f208) " circle " cross section	91.5	0.59

Example 2

Derive from the POY sample of example 1, yarn 1A and yarn 1C relatively are that spinning is 96 dtexs and 26 threads, on a DCS1200 Texturing Machines with 600 meters/minute speed by false twist texturing (FTT).The elementary heating member of Texturing Machines is 220 ℃, does not use second level heating member.The stretcher strain yarn of one 78 dtexs and 26 threads (78f26) is produced with the 6mm solid ceramic dish of the Texturing Machines that is configured to 1/7/1 smooth/work/smooth.The 78f26 yarn is made into the flat pin double rib of 28 pins fabric by circle, washs dyeing and HEAT SETTING.The fabric sample of 300mm * 25mm is used for carrying out water absorption test.These samples vertical were suspended in the water-bath and measured the vertical lifting amount of water after 2 minutes.The average of 3 samples is given in the table 2.The fabric that is made of the yarn of the long filament with advantageous cross sections shows that water imbibition is better than the fabric of the same spline structure that the yarn by circular filament cross forms.This advantage is 2 times improvement at least aspect water absorbing properties.

Table 2

The textured yarns of use on circular knitted fabric	In mm vertical lifting amount (fabric along length direction)	In mm vertical lifting amount (fabric is along the shortest direction)
The textured yarns of use on circular knitted fabric			78f26 Compare circular cross section(yarn 1C) false twist texturing yarn	1.5	0
78f26 Cross section of the present invention(yarn 1A) false twist texturing yarn	3.7	2.7		1.5	0

Example 3

52 spinneretss spinnings capillaceous of the shape of cross section that the drawing of a kind of 192 dtexs and 52 long filaments has Fig. 3 a with device and the use of Fig. 5.49.4RV nylon 66 polymer of (being made by the formic acid method) are melted in 10 and pushed a polymer filtration sub-assembly 20 also subsequently through remaining on the spinnerets 30 of 280 ℃ of spinning temperatures.The long filament of extruding 40 is cooled by horizontal air flow 50, and its air velocity is 0.4 meter/minute.Laterally air flow 50 is directed to two sections bossings of facing mutually 38 capillaceous that at first run into as Fig. 3 a.The long filament that is cooled is converged to yarn beam 60 to apply You Heshui, and advances along another path A.Yarn with as entwine at normally used in the art air nozzle 80.Be sent on second godet roller 94 and the separate roller that links to each other (draw roll) by feed roller 92 and the separate roller that links to each other (preventing sliding stop around several circles on the roller) subsequently by the yarn 90 of being entwined, it moves greater than the superficial velocity of the superficial velocity 80% of feed roller 92 with superficial velocity.The yarn beam 90 of being entwined is stretched with 1.8 overall coefficients, reduces whole denier count as received.The yarn 100 that has stretched is processed with typing stretching and lax yarn by a vapour injecton arrangement 110.By lax yarn beam 120 through second entwine injection apparatus 130 and subsequently yarn 140 be wound up on the bobbin 150 with 3800 meters/minute speed.This technology provides that to have the yarn linear density be 192 dtexs, and elongation at break is 42.8%, and intensity is the full drawing cake of 41cN/tex.The yarn of dried forms has the 50.3RV that is obtained by the formic acid method.The long filament of this 52 filament yarns has the shape of cross section perpendicular to longitudinal axis, and it is the long filament of the similar Fig. 4 of being shown in a basically.

This yarn, yarn 3A be the weft yarn as the Woven fabric of 3/1 twill-weave, and warp thread is 78 dtexs (51 circular long filaments).The detailed description of weaving process and fabric processing is given in the table 3.As a comparative example, the full drawing of 192 dtexs and 52 long filaments is to spin by above-mentioned mode fully, but employed be a kind of " circular cross section " spinning plate capillaceous that has, this yarn is referred to as yarn 3B.Second fabric sample is to use yarn 3B to be woven as above-mentioned mode as weft yarn.The detailed description of weaving process and fabric processing is given in the table 3.Two kinds of fabrics are with identical grey cloth, dyeing and the processed processing of HEAT SETTING mode.Cut out 10 75 square millimeters sample from each fabric sample (grey cloth, dyeing and HEAT SETTING).These samples utilize a kind of mircrometer gauge to measure fabric thickness in an identical manner.The result that fabric thickness is measured (averages of 10 measurements) is provided in the table 3.The fabric that includes as the preferable cross section long filament of weft yarn is thicker than complete in the woven fabric of circular cross section long filament as warp thread and weft yarn.Therefore, have preferable cross section long filament as the woven fabric of weft yarn provide lightweight attractive in appearance than the low-density fabric.

Table 3

	Greige goods fabric	Greige goods fabric	DYED FABRICS	DYED FABRICS	The HEAT SETTING fabric	The HEAT SETTING fabric
	Greige goods fabric	Greige goods fabric	DYED FABRICS	DYED FABRICS	The HEAT SETTING fabric	The HEAT SETTING fabric		Yarn 3B	Yarn 3A	Yarn 3B	Yarn 3A	Yarn 3B	Yarn 3A
The every cm weft yarn of every cm warp thread x	57.5 x 38.8	58.2 x 39.7	61.3 x 40	62.2 x 39.8	61.5 x 41	61.6 x 41		Yarn 3B	Yarn 3A	Yarn 3B	Yarn 3A	Yarn 3B	Yarn 3A
The every cm weft yarn of every cm warp thread x	57.5 x 38.8	58.2 x 39.7	61.3 x 40	62.2 x 39.8	61.5 x 41	61.6 x 41	Woven fabric thickness mm	0.22	0.24	0.20	0.22	0.20	0.21

The foregoing description has only been made description by the mode of example.But according to long filament of the present invention, yarn, other embodiment of some of spinning head and technology will be very clearly for the reader who is familiar with technology.

Claims

CLAIMS 1. A profiled polymeric filament having an open hollow cross-sectional shape perpendicular to the longitudinal axis of the filament, wherein the dimension of the cross-section prevents the filament from interlocking with a second filament of the same cross-section.

2. A profiled polymeric filament having an open hollow cross-sectional shape perpendicular to the longitudinal axis of the filament, wherein the regions near each end of the cross-section are greater than the gap between said regions defining the opening of the open hollow cross-section Width.

3. The shaped polymeric filament of claim 1 or 2, wherein the cross-section comprises a solid portion, a central hollow region, and an opening into the central hollow region, wherein the opening subtends a radial direction of less than 90° horn.

4. The shaped polymeric filament of claim 3, wherein said openings subtend a radial angle of less than 90°.

5. The shaped polymeric filament of claim 1 or 2, wherein the cross-section comprises a solid region, a central hollow region, and a slit leading into the central hollow region, wherein the filament cross-section is at a region adjacent the slit The radial thickness of the solid portion of is greater than the average radial thickness of the solid region.

6. The shaped polymer filament according to claim 1 or 2, wherein the cross-section includes a base portion having first and second ends and two side portions, the side portions being separated from the base portion in a substantially parallel relationship. extending from the first and second ends.

7. The shaped polymeric filament of claim 6, wherein the base portion and the two side portions are arcuate in shape.

8. A profiled polymeric filament having a cross-sectional shape perpendicular to the longitudinal axis of the filament, said cross-sectional shape having a central arcuate portion and first and second elongated branch portions, each The branch portions have proximal and distal portions, the proximal portion is connected to the central portion and the distal portion is connected to a base on each branch portion, the base has a dimension F, the branch portions and said central arcuate portion defining an open portion, said bottom portion being oriented in a substantially parallel relationship and defining a slot opening thereto; said slot having a dimension D, wherein dimension D is less than dimension F.

9. The shaped polymeric filament of claim 8, wherein the polymer is polyamide.

10. The shaped polymeric filament of claim 9, wherein the polyamide polymer has a relative viscosity greater than 40 according to the formic acid method.

11. The shaped polymeric filament according to claim 10, wherein the relative viscosity of the polyamide according to the formic acid method is in the range of 46 to 56.

12. The shaped polymeric filament of claim 11, wherein the filament has a linear density of less than 20 decitex.

13. The shaped polymeric filament of claim 11, wherein the filament has a linear density of less than 4 decitex.

14. The shaped polymeric filament of claim 8, wherein the filament cross section is substantially constant along the length of the filament.

15. The shaped polymeric filament of claim 8, wherein the polymer is selected from the group of nylon 66 and nylon 6 and copolymers of nylon 66 or nylon 6.

16. A multifilament yarn comprising at least a portion of the shaped filaments of any one of claims 1-15.

17. The multifilament yarn according to claim 16, wherein the yarn consists essentially of said open hollow filaments according to the invention.

18. The multifilament yarn of claim 16, wherein the yarn is a drawn yarn.

19. The multifilament yarn of claim 18, wherein the yarn has an elongation at break of about 20 to 50% and a tenacity of about 25 to 60 cN/tex.

20. The multifilament yarn of claim 16, wherein the yarn is a partially oriented yarn (POY).

21. The multifilament yarn of claim 20, wherein the yarn has an elongation at break of about 55 to 85% and a tenacity of about 25 to 40 cN/tex.

22. An article comprising at least a portion of the multifilament yarn of claim 16.

23. The article of claim 22, wherein the article comprises a fabric knitted or woven from the multifilament yarn.

24. A spinneret for producing hollow filaments with special-shaped openings according to any one of claims 1 to 21 by melt extruding a polymer into filaments, wherein said spinneret comprises a and either (a) each capillary has an open hollow transverse section, or (b) each capillary comprises two adjacent segments, whereby when the molten polymer streams from each segment are combined in the segment An open hollow filament cross-section along the longitudinal axis of the filament is obtained at a point in between.

25. The spinneret according to claim 24, wherein: each capillary is made of two sections; each section includes a straight line section, and the straight line section has a connecting portion with a pair of protrusions at each end; At one end, the pair of projections are equal in area and each include a rectilinear portion terminating in a circular portion; at the second end, the pair of projections are unequal in area and each include a rectilinear portion terminating in a circular portion .

26. The spinneret of claim 25, wherein each segment is a mirror image of the other segment.

27. The spinneret of claim 26, wherein each segment is a non-superimposable mirror image of the other segment.

28. The spinneret according to claim 24, wherein the capillary itself has an open hollow cross-section, and each capillary has a cross-sectional shape comprising:

a first straight portion having a first end and a second end opposite to each other;

a second straight portion branching from the first end portion of the first portion and a third straight portion, wherein the second straight portion terminates in a circular portion and the third straight portion extends to the first point of the branch;

a fourth rectilinear portion and a fifth rectilinear portion extending from said first point of the branch, wherein the fourth and fifth rectilinear portions have unequal areas and each terminate in a circular portion;

a sixth straight portion and a seventh straight portion branching from the second end of the first straight portion, wherein the sixth straight portion terminates in a circular portion and the seventh straight portion extends to the second point of the branch; and

Eighth and ninth rectilinear portions extending from the second point of the branch, wherein the eighth and ninth rectilinear portions have unequal areas, and each rectilinear portion terminates in a circular portion.

29. A process for producing a drawn yarn with a modified filament cross-section according to any one of claims 1 to 21, the process comprising: extruding a polyamide melt through a A spinneret of either type; cools the extruded melt with a transverse air stream to form solid filaments; optionally passes the cooled filaments through a steam environment, applies a fiber finishing oil, and optionally interweaves the yarns A thread that passes the yarn over a pair of feed and draw rollers with a fixed amount of difference in surface speed, the drawn yarn is treated to reduce final yarn shrinkage to obtain a good yarn The wire package is formed, optionally a fiber finish is applied, the yarns are interlaced and the filaments are wound at speeds greater than 3000 m/min.

30. A process for the manufacture of partially oriented yarns (POY) with an improved filament cross-section according to any one of claims 1 to 21, the process comprising: extruding a polyamide melt through Spinnerets of any one of 24 to 28; the extruded melt is cooled by transverse air flow to form solid filaments; optionally, the cooled filaments are passed through a steam environment, and a fiber finishing oil is applied, optionally The yarn is optionally passed over tension control rollers, optionally interlaced and the filaments are wound at a speed greater than 3000 m/min.

31. A process as claimed in claim 29 or 30 wherein the polymer is a polyamide of 40 to 60 RV measured in formic acid.

32. The process of claim 29 or 30, wherein the spinneret temperature is about 245°C to 295°C.

33. A process according to any one of claims 29 to 30, wherein the velocity of the cross air flow is about 0.15 to 0.5 m/min.

34. The process according to claim 29, wherein the cooled filaments are further processed before winding as follows: the cooled filaments are converged into yarn bundles; the yarn bundles are sent to the first godet ( feed roll) followed by a second godet (94) (drawing roll), wherein the second godet operates at a surface speed greater than that of the feed roll by 10 to 100% to draw the yarn and thus Reducing overall yarn denier; heat treating drawn yarn to set the stretch and relax the yarn to provide a drawn yarn.

35. The process according to claim 30, wherein the cooled filaments are further processed before winding as follows: the cooled filaments are converged into yarns; the converged yarns are sent through steam containing interlayer tubes Environment; steam treated yarn was interlaced and wound to provide a partially oriented yarn (POY).

36. A multifilament air jet textured yarn produced from said drawn yarn according to claim 18.

37. A multifilament air jet textured yarn produced from said partially oriented yarn according to claim 20.

38. A multifilament false twist textured (FTT) yarn produced from said partially oriented yarn of claim 20.